I don't want u-joint any more!

[brad65]

Hey guys whats up I'm a newbie on the fourm but I'v been in the rc hobby for years. I know I should have purchased the BlackJack26 first instead of the apache but I can't help modding things. I've already blown up the stock esc and the stock brushed motor with my 3s 5000 maxamp. I then installed a traxxas 14.4v Tatian motor which I soder brass tubes for water cooling to the brushed ends with help alot. I even got to run 4s 2000mah with the traxxas 16.8v esc which really made the body move but the motor is starting to smell, it just can't handle it.

Needless to say I have a 2600kv water cooler brushless 540size with 1/8 motor shaft motor and 60a water cooled esc on order for this boat. But I know I can install everything as is but I'm going to destroy the u-joint with 3s or 4s if not the first time out. So.... I know nothing about flex shafts and the like. Is there a kit that comes with everthing I need to change over? I just don't what to piece things out, I want something that is made for this size boat and wouldnt need major modding. Please guys point be in the right direction

[SweetZ28]

Hi Here is what you can do look through this and on page 2 there is the size cable and tubing that i used shown on my order list.

http://forums.offshoreelectrics.com/...ead.php?t=1667

[brad65]

I'm now more comfused LOL. I will try to read though and figure out what your using. So there is not a kit per say yet that comes with everything?

[egneg]

When I converted my Kyosho Hurricane to brushless I was worried about the u-joint as well so I picked up another graupner coupling just in case. I am running a KB45/100 amp esc/detongued X645 and the spare is still in the case. It tends to spin out now in turns but I have not had any problems with the coupling.

[Jeff Wohlt]

Set it up right. New strut, rudder and flex cable with coupler and you will have a good set up. Any steerable strut is not worth having unless you plan to stay at 16 mph.

[Diegoboy]

I'm now more comfused LOL. I will try to read though and figure out what your using. So there is not a kit per say yet that comes with everything?

It's not as bad as it seems. If you have any questions or issues, We're here to help.

[brad65]

http://www.cornwallmodelboats.co.uk/acatalog/graupner_1159.html

how about this will it work with this boat?

[brad65]

Ok guys, I got my 2800kv bushless motor and 60amp esc after an hour of esc programing LOL. I took to the water. OMFG! this thing is down right sick with a 3s 2200mah battery. The only thing that gets warm is the battery. I need to keep the ass from kicking out and uncontrolable at high speeds. I also own a SV27 that I run on 4s total lipos, and this is almost or as fast. I'm very happy for once I did something right LOL. I thought the gear would crap out but I'm still using a Octure Y534 Plastic prop its same size as stock I believe. I purchased a stock blackjack prop but I'm scared to try it, this thing is a missle as is. Ok now someone please steer me in the right direction with some turn fins etc. Will this kept the ass end stable? Should I just make something similar to the blackjacks fins? Any help would be great, thanks guys.

[FE Wannabe]

Turn fins may help a little, but as Jeff mentioned a few posts ago, the outdrive has to go! The directional thrust of an outdrive on a RC sized boat just can't turn effectively at these brushless speeds. That being said there are exceptions, but they are very expensive (i.e. MHZ).
I am in a similar situation as you are, my Apache has a Feigao 10L 2458kv on 3S 4500mah 20C with a 70amp ESC and currently a x534 plastic as well. I rarely bring mine in right side up. I make good use of my rescue boat.

[brad65]

I'm having a blast with mine. I've run it for friends and family and everyone thinks it's faster and more controlable than my sv27. Granted I haven't tweeked the sv yet. But so far I can't complain about the u joint holding up. I really wanted to change it but not any more just isn't worth it on this weak very light plastic hull anyway. I think since its so damn light in weight you can get away with a small prop which saves the u joint. If I get a bj26 down the road I'd up grade to. A flex shaft.

[SweetZ28]

Hi Guy's ...you guy's with the brushless systems I have a ? for you.... I don't want to run 3S only 2s and 6 cells... what motor should i get a 3500KV or up tawards a 4100KV?

Thanks

[egneg]

I would say the the second one would be closer to the target 30,000 rpm - but I could be wrong about this.

[brad65]

Hi Guy's ...you guy's with the brushless systems I have a ? for you.... I don't want to run 3S only 2s and 6 cells... what motor should i get a 3500KV or up tawards a 4100KV?

Thanks

You might be right with a higher kv with a lower volt battery. Boy I need to make you guys a video with only a 3s 2200mah 25c/35c burst battery, 2800kv motor, & 60amp esc it not only is sick in speed I'm getting over 10 mins easy hard on the throtle. I'm gonna weight it today I'm thinking it weighs 2 lb's.

[SweetZ28]

Lets see 4100KV X 7.2 =29.52RPM!! LOOKS PERFECT!!
Whare do you get a cheap brushless ESC for a 4.000 something KV motor...what amp rate is needed?

THANKS

[FE Wannabe]

Lets see 4100KV X 7.2 =29.52RPM!! LOOKS PERFECT!!
Whare do you get a cheap brushless ESC for a 4.000 something KV motor...what amp rate is needed?

THANKS

Z28,
That setup looks like it should run good.
I am not sure what brand motor you are wanting to run, but you will need to pick your ESC and battery around the max amps of the motor. Normally the higher the KV the higher the amp draw. If it is the Feigao 6L, it can draw up to 102 amps. I would recommend a 100amp ESC and a 7.4V 5000mah 20C battery.
Brad65 had mentioned that his battery comes back warm and he is using a 2200mah battery at 25C which maxs out at 55amps and he is running a 2800kv motor.

As for cheap ESCs, you can normally score some cheap ESCs on eBay, but you may need to water cool them yourself. Just search for brushless ESC on eBay and you should find some good deals, under $30 shipped. Otherwise, go to the swap shop and put in a want to buy add for a ESC, you might find someone that might have something for you at a great price.
In a straight line my Apache is a blast, it appears to be running around 35mph or better. I scored most all of my parts for it in the swap shop.
Have fun!!!
Brad